The testing I saw seemed pretty conclusive and came from reddit.
As far as Meteor vs Final Heaven damage, on ADS they both did the same damage when my Coil group was trying to figure out who should be LBing so I assume that the damage from Meteor gets split between targets but I've never cared enough to change my chat filters to verify. I'm inclined to think it's actually weapon iLevel and not weapon damage that influences the LB damage because mage weapons would have a disproportionate influence otherwise, but both get increased the same way so for the purposes of this discussion it seems irrelevant.
Edit: The easiest way to retest would probably be on Ifrit because of how frequently the gauge fills, if people are sceptical.
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